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To address these problems, a novel mobile relaying technique by employing unmanned aerial vehicles (UAVs) is considered to facilitate data dissemination in vehicular environments where the communication infrastructures are not available or the network connectivity is poor. This paper studies and formulates the throughput maximization problem in UAV-assisted VANETs, which aims to achieve high throughput while guarantee the delay constraint of data flows to the vehicles in the area. To maximize the network throughput, the maximization problem tries to find an optimal delivery strategy for data dissemination by optimizing the transmission rate. To solve the problem, the knapsack problem can be reduced to the maximization problem, which is proved NP-hard. A polynomial time approximation scheme is proposed to achieve an approximate solution. Detailed theoretical analysis including time complexity and approximation ratio of the proposed algorithm is presented. Simulation results demonstrate the effectiveness of the proposed algorithm.<\/jats:p>","DOI":"10.1155\/2018\/8548301","type":"journal-article","created":{"date-parts":[[2018,10,25]],"date-time":"2018-10-25T20:08:09Z","timestamp":1540498089000},"page":"1-12","source":"Crossref","is-referenced-by-count":25,"title":["UAV-Assisted Data Dissemination in Delay-Constrained VANETs"],"prefix":"10.1155","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1979-5013","authenticated-orcid":true,"given":"Xiying","family":"Fan","sequence":"first","affiliation":[{"name":"School of Computer Science, Wuhan University, Wuhan, China"},{"name":"Collaborative Innovation Center of Geospatial Technology, Wuhan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5554-4871","authenticated-orcid":true,"given":"Chuanhe","family":"Huang","sequence":"additional","affiliation":[{"name":"School of Computer Science, Wuhan University, Wuhan, 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